CN109244568B - Control method and device for power battery and vehicle - Google Patents
Control method and device for power battery and vehicle Download PDFInfo
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- CN109244568B CN109244568B CN201810872497.4A CN201810872497A CN109244568B CN 109244568 B CN109244568 B CN 109244568B CN 201810872497 A CN201810872497 A CN 201810872497A CN 109244568 B CN109244568 B CN 109244568B
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- 238000010438 heat treatment Methods 0.000 claims abstract description 66
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The disclosure relates to a control method and device for a power battery and a vehicle. The method comprises the following steps: when a vehicle is powered off, controlling a battery management system of the vehicle to wake up periodically; when the battery management system is awakened and the vehicle is not in a charging state, detecting the temperature of the power battery; when the temperature of the power battery is determined to be less than a predetermined first temperature threshold, a power battery heating system of the vehicle is activated to heat the power battery. Therefore, when the vehicle is stored in a low-temperature environment, the power battery can be automatically heated and kept in a proper temperature state so as to meet the power supply requirement of the vehicle.
Description
Technical Field
The disclosure relates to the field of vehicle control, in particular to a control method and device for a power battery and a vehicle.
Background
Because of the clean energy and environmental friendliness of electric vehicles, more and more users currently choose electric vehicles or hybrid vehicles for travel. The power battery of the electric vehicle can be normally used at a specific ambient temperature. If the ambient temperature is too low, the basic charge and discharge functions of the power battery are affected. Electric vehicles are typically provided with a dedicated power battery heating system that heats the power battery when necessary.
Although the temperature characteristics of the power battery of the current electric vehicle are greatly improved compared with the temperature characteristics of the power battery, the performance of the power battery is still greatly influenced by low temperature.
Disclosure of Invention
The purpose of this disclosure is to provide a convenient, effective control method, device and vehicle for power battery.
In order to achieve the above object, the present disclosure provides a control method for a power battery. The method comprises the following steps: when a vehicle is powered off, controlling a battery management system of the vehicle to wake up periodically; when the battery management system is awakened and the vehicle is not in a charging state, detecting the temperature of the power battery; when the temperature of the power battery is determined to be less than a predetermined first temperature threshold, a power battery heating system of the vehicle is activated to heat the power battery.
Optionally, the method further comprises: and when the temperature of the power battery is greater than a second temperature threshold value, controlling a power battery heating system of the vehicle to stop heating the power battery.
Optionally, when it is determined that the temperature of the power battery is less than a predetermined first temperature threshold, the step of activating a power battery heating system of the vehicle to heat the power battery comprises: and when the temperature of the power battery is judged to be smaller than a preset first temperature threshold value and the state of charge of the power battery is larger than a preset first state of charge threshold value, starting a power battery heating system of the vehicle to heat the power battery.
Optionally, the method further comprises: judging whether the vehicle enters a low-temperature protection mode or not;
the step of controlling the battery management system of the vehicle to periodically wake up when the vehicle is powered off comprises the following steps: when the vehicle is determined to have entered the low-temperature protection mode and the vehicle is powered down, controlling a battery management system of the vehicle to wake up periodically.
Optionally, before the step of determining whether the vehicle enters the low-temperature protection mode, the method further comprises: and when receiving a starting instruction sent by a vehicle networking server, controlling the vehicle to enter the low-temperature protection mode, wherein the vehicle networking server forwards the starting instruction to the vehicle associated with the user terminal when receiving the starting instruction sent by the user terminal.
Optionally, before the step of determining whether the vehicle enters the low-temperature protection mode, the method further comprises: and when a man-machine interaction device in the vehicle receives a starting instruction, controlling the vehicle to enter the low-temperature protection mode.
Optionally, the method further comprises one or more of: counting the heating times of the power battery during the power-off period of the vehicle; when the counted heating times reach the preset times, controlling the vehicle to exit the low-temperature protection mode; when the door of the vehicle is unlocked, controlling the vehicle to exit the low-temperature protection mode; when the vehicle is in a reserved charging state, controlling the vehicle to exit the low-temperature protection mode; and when the state of charge of the power battery is smaller than a preset first state of charge threshold value, controlling the vehicle to exit the low-temperature protection mode.
Optionally, the method further comprises: and when the state of charge of the power battery after heating is smaller than a preset second state of charge threshold value, controlling a charging gun connected with the vehicle to enter a charging state.
Optionally, a value range of the second temperature threshold is determined according to the following formula:
G·T3-a<T2<G·T3+a
wherein, T2Representing said second temperature threshold, T3Indicating a predetermined third temperature threshold, TEnvironment(s)Indicating the ambient temperature, TBattery with a battery cellThe temperature of the power battery is represented, a represents a preset temperature value, c represents the specific heat capacity of the power battery, m represents the mass of the power battery, and g represents a correction coefficient.
The present disclosure also provides a control device for a power battery. The device comprises: the wake-up control module is used for controlling the battery management system of the vehicle to wake up periodically when the vehicle is powered off; the detection module is used for detecting the temperature of the power battery when the battery management system is awakened and the vehicle is not in a charging state; the starting module is used for starting a power battery heating system of the vehicle to heat the power battery when the temperature of the power battery is judged to be smaller than a preset first temperature threshold value.
The present disclosure also provides a vehicle configured to execute the steps in the control method for a power battery provided by the present disclosure.
Through the technical scheme, when the vehicle is powered off, the battery management system of the power battery is awakened periodically, and when the temperature of the power battery is judged to be too low, the power battery is heated. Therefore, when the vehicle is stored in a low-temperature environment, the power battery can be automatically heated and kept in a proper temperature state so as to meet the power supply requirement of the vehicle.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart of a control method for a power cell provided by an exemplary embodiment;
FIG. 2 is a flow chart of a control method for a power cell provided in another exemplary embodiment;
fig. 3 is a block diagram of a control device for a power battery according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The present disclosure is applicable to electric vehicles and hybrid vehicles, collectively referred to as vehicles below. The power battery in the present disclosure is a battery that provides driving force for the vehicle, and is also called a high-voltage battery.
Fig. 1 is a flowchart of a control method for a power battery according to an exemplary embodiment. As shown in fig. 1, the method includes the following steps.
In step S11, when the vehicle is powered off, a Battery Management System (BMS) that controls the vehicle periodically wakes up.
When the key of the vehicle is in the OFF gear, the vehicle is powered OFF, at the moment, the power battery does not supply power, and the BMS is in a dormant state. The periodic wake-up may be, for example, every 10 minutes.
In step S12, when the BMS is awakened and the vehicle is not in the charging state, the temperature of the power battery is detected.
The temperature of the power battery may be acquired using the BMS. The present disclosure excludes low temperature protection in the case of a vehicle in a charged state, considering that the heating system of the power battery heats the power battery when necessary.
In step S13, when it is determined that the temperature of the power battery is less than the predetermined first temperature threshold, a power battery heating system of the vehicle is activated to heat the power battery.
When the temperature of the power battery is less than the first temperature threshold, it can be considered that the charging and discharging functions of the power battery are seriously affected and heating is required. The first temperature threshold may be, for example, -18 ℃.
Through the technical scheme, when the vehicle is powered off, the battery management system of the power battery is awakened periodically, and when the temperature of the power battery is judged to be too low, the power battery is heated. Therefore, when the vehicle is stored in a low-temperature environment, the power battery can be automatically heated and kept in a proper temperature state so as to meet the power supply requirement of the vehicle.
Fig. 2 is a flowchart of a control method for a power cell according to another exemplary embodiment. As shown in fig. 2, on the basis of fig. 1, the method further includes step S14.
In step S14, the power battery heating system of the vehicle is controlled to stop heating the power battery when the temperature of the power battery is greater than the second temperature threshold.
The second temperature threshold may be a preset temperature value. When the temperature of the power battery is greater than the second temperature threshold, the charging and discharging functions of the power battery are considered to be less affected by the temperature. The first temperature threshold and the second temperature threshold may be determined empirically or experimentally based on the temperature characteristics of the power cell.
Therefore, the heating of the power battery can be automatically stopped, and the power battery can be kept in a proper temperature state to meet the power supply requirement of the vehicle.
In yet another embodiment, the State of Charge (SOC) of the power battery may be considered at the same time, and in this embodiment, when it is determined that the temperature of the power battery is less than the predetermined first temperature threshold value on the basis of fig. 1, the step of activating the power battery heating system of the vehicle to heat the power battery (step S13) may include: and when the temperature of the power battery is determined to be smaller than a preset first temperature threshold value and the SOC of the power battery is determined to be larger than a preset first state of charge threshold value, starting a power battery heating system of the vehicle to heat the power battery.
That is, if the SOC of the power battery is less than or equal to the predetermined SOC threshold, the power battery heating system is not activated and the power battery is not heated. This is considered to be because if the power battery itself is short of electricity, its own discharge capability is insufficient, and even if it is heated, it is not significant for driving the vehicle. Moreover, when the power battery heating system heats the power battery, the electric quantity of the power battery is consumed, and the SOC of the power battery is further reduced.
The predetermined SOC threshold value (e.g., 25%) may be set slightly greater than the SOC value (e.g., 20%) corresponding to the vehicle ignition low battery indication.
In the embodiment, the SOC of the power battery is increased to judge whether the power battery is heated or not in the reference factors, so that the heating requirement of the power battery is judged more accurately and practically in a fitting manner, the heating blindness is reduced, and the heating is more effective.
The function realized by the above steps may be a function set when the vehicle leaves the factory, and the function may not have the selectivity of opening and closing. In yet another embodiment, entry into or exit from the cryoprotection mode may also be selectable by the user. The low-temperature protection mode is that when the vehicle enters the low-temperature protection mode, the power battery of the vehicle can be automatically heated by utilizing the steps provided by the disclosure, namely, the low-temperature protection function of the vehicle is started.
Since the vehicle's low-temperature protection mode is selectively controllable to enter and exit, before the above steps are performed, it can be determined whether the current vehicle has entered the low-temperature protection mode, that is, whether the vehicle's low-temperature protection function has been turned on.
In this embodiment, on the basis of fig. 1, the method may further include: and judging whether the vehicle enters a low-temperature protection mode or not. And, when the vehicle is powered off, the step of controlling the BMS of the vehicle to wake up periodically (step S11) may include: when it is determined that the vehicle has entered the low temperature protection mode and the vehicle is powered down, the BMS controlling the vehicle periodically wakes up.
When the vehicle leaves a factory, the function can be set to be on by default or off by default, the on mode of the function can be set, the low-temperature protection function is enabled to be on through the set on mode, and the vehicle enters the low-temperature protection mode.
In yet another embodiment, before the step of determining whether the vehicle enters the low temperature protection mode, the method may further include: and when receiving a starting instruction sent by the Internet of vehicles server, controlling the vehicle to enter a low-temperature protection mode. The vehicle networking server forwards the opening instruction to the vehicle associated with the user terminal when receiving the opening instruction sent by the user terminal.
In this embodiment, the user may transmit an open instruction for instructing to open the cryogenic protection function through the communication terminal. That is, the user may register his or her vehicle and user terminal in the in-vehicle network server in advance. For example, through downloading the APP from the user terminal, the mobile phone number and the license plate number are registered, so that the mobile phone number and the license plate number are stored in the internet of vehicles server in an associated manner. Therefore, a user can send a starting instruction to the Tbox in the vehicle through the Internet of vehicles on the mobile phone of the user to control the vehicle to start the low-temperature protection function. Similarly, the user may control the function to be turned off in a similar manner (via the user terminal and the car networking server).
In the embodiment, a user can control the low-temperature protection function to be turned on or turned off through the user terminal, so that the method and the device are convenient and fast, high in autonomy and high in automation degree.
In yet another embodiment, before the step of determining whether the vehicle enters the low temperature protection mode, the method may further include: and when the human-computer interaction device in the vehicle receives a starting instruction, controlling the vehicle to enter a low-temperature protection mode. For example, the user may click a corresponding soft key in the human-machine interface of the in-vehicle device or turn on or off the function by pressing a dedicated physical key in the vehicle.
In the embodiment, a user can control the low-temperature protection function to be turned on or turned off through the man-machine interaction device arranged in the vehicle, so that the vehicle is convenient and quick to use and high in reliability.
The number of times the power cell is heated may be appropriately limited in consideration of the economy and necessity of heating the power cell. In yet another embodiment, the method may further include:
counting the heating times of the power battery during the power-off period of the vehicle; and when the counted heating times reach the preset times, controlling the vehicle to exit the low-temperature protection mode.
That is, the number of times of heating is counted after each heating, and when the number of times of heating reaches a predetermined number of times (for example, 5 times) during one power-off of the vehicle, the cryoprotection function is turned off and the cryoprotection mode is exited. When the vehicle is next powered down, it is counted again.
In this embodiment, the number of times of heating during each parking of the vehicle is limited, so that excessive loss of the power battery capacity due to heating of the power battery is avoided.
The control method in the disclosure can be applied to the low-temperature protection of the power battery when a user is not on the vehicle site. If the user is on the site of the vehicle, it may be considered that the necessity of turning on the cryogenic protection function at this time is not great. In yet another embodiment, the method further comprises: and when the door of the vehicle is unlocked, controlling the vehicle to exit the low-temperature protection mode.
That is, if the door of the vehicle is unlocked, it may indicate that the vehicle owner is on the site of the vehicle, and the vehicle owner can perform necessary maintenance on the vehicle autonomously, and at this time, the necessity of low-temperature protection is not great, so the vehicle is controlled to exit the low-temperature protection mode. In the embodiment, the possibility of autonomous maintenance of the vehicle by the vehicle owner is considered, unnecessary low-temperature protection is avoided, and the economical efficiency is better.
As described above, the necessity for the vehicle to be in the low-temperature protection mode when the vehicle is in the reserved charge state is not so great, and therefore, if the vehicle enters the reserved charge state again during the low-temperature protection mode, the vehicle can be controlled to exit the low-temperature protection mode.
In yet another embodiment, the method may further include: and when the vehicle is in the reserved charging state, controlling the vehicle to exit the low-temperature protection mode.
That is, the necessity of performing the low-temperature protection is not so great when the vehicle is in the scheduled charge state, and therefore, the vehicle can be controlled to exit the low-temperature protection mode upon detection of the vehicle being in the scheduled charge state. In the embodiment, unnecessary heating of the power battery is avoided, and the low-temperature protection of the power battery is more practical.
When the SOC of the power battery is small, the necessity of low-temperature protection of the power battery is not too large. Therefore, if the vehicle detects that the SOC of the power battery is small while the vehicle is in the low-temperature protection mode, the vehicle may be controlled to exit the low-temperature protection mode.
In yet another embodiment, the method may further include: and when the SOC of the power battery is smaller than a preset first state of charge threshold value, controlling the vehicle to exit the low-temperature protection mode.
This is considered to be because if the power battery itself is short of electricity, its own discharge capability is insufficient, and even if it is heated, it is not significant for driving the vehicle. Moreover, when the power battery heating system heats the power battery, the electric quantity of the power battery is consumed, and the SOC of the power battery is further reduced.
In this embodiment, judge power battery's heating demand more accurately, laminating ground actually, reduce the blindness of heating, make the heating more effective.
Sometimes, when the charging gun is plugged in the vehicle for charging, the vehicle owner leaves the vehicle, and the charging gun automatically stops charging after the vehicle owner is fully charged, but the vehicle owner does not pull out the gun. When the temperature of the power battery is lowered, heating can be performed by the above method. And certain electric quantity is consumed by heating, and the state of charge of the power battery is reduced after heating. In yet another embodiment of the present disclosure, the charging gun may be automatically controlled to enter the charging state when the state of charge after heating is below a predetermined threshold.
In this embodiment, the method may further include: and controlling a charging gun connected with the vehicle to enter a charging state when the state of charge of the power battery after heating is smaller than a preset second state of charge threshold value.
The charging gun can be charged in various ways. For example, the charging gun is controlled to enter a reserved charging process, or the vehicle is controlled to send a confirmation request to a communication terminal of the vehicle owner through the internet of vehicles, and when the vehicle owner sends a confirmation message in response to the confirmation request, the charging gun is controlled to charge the power battery. The second state of charge threshold may be set to 90%, for example.
In this embodiment, can carry out charge control to the rifle that charges of connection on the vehicle to compensate the electric quantity of heating power battery in-process loss, be favorable to providing continuous electric power guarantee for power battery's low temperature protection.
In yet another embodiment, controlling a charging gun coupled to a vehicle to enter a state of charge when a state of charge of a power battery after heating is less than a predetermined second state of charge threshold comprises: and when the state of charge of the power battery after heating is smaller than a preset second state of charge threshold value, controlling a charging gun connected with the vehicle to charge the power battery.
That is, when it is determined that the state of charge of the power battery after heating is less than the second state of charge threshold value, the charging gun is controlled to immediately charge the power battery. In the embodiment, continuous power guarantee can be provided for low-temperature protection of the power battery.
The second temperature threshold may be a preset temperature value, or may be a value determined in real time according to the ambient temperature and the temperature of the power battery. In an embodiment, the value range of the second temperature threshold is determined according to the following formula:
G·T3-a<T2<G·T3+a
wherein, T2Representing said second temperature threshold, T3Indicating a predetermined third temperature threshold, TEnvironment(s)Indicating the ambient temperature, TBattery with a battery cellThe temperature of the power battery is represented, a represents a preset temperature value, c represents the specific heat capacity of the power battery, m represents the mass of the power battery, g represents a correction coefficient, and ln is a natural logarithm.
T3It can be understood that the temperature value reached by the power battery after heating is a more reasonable temperature value for charging and discharging. T is3(e.g., -15 ℃) may be set to be slightly greater than the lower limit (e.g., -20 ℃) of the temperature required for the power battery to be able to be normally charged and discharged. g may be a predetermined value. T isEnvironment(s)And TBattery with a battery cellIs a value detected in real time. G can be regarded as T under the condition of different environmental temperatures and power battery temperatures3The correction coefficient of (1). a can be regarded as a bias parameter, and the heat tolerance of the power battery can be corrected. g. G, a, T3May be derived empirically or experimentally. A and T described above3G, m, c, a, may have different values for different power cells.
After determining the range of the second temperature threshold by the above formula, the second temperature threshold can be selected within the range. The second temperature threshold value selected by the formula can reasonably determine the terminal point of the power battery temperature heating, so that the power battery is more reasonable to heat, and the economy is better.
The present disclosure also provides a block diagram of a control apparatus for a power battery. Fig. 3 is a control device for a power battery according to an exemplary embodiment. As shown in fig. 3, the control device 10 for a power battery may include a wake-up control module 11, a detection module 12, and a start module 13.
The wake-up control module 11 is used for controlling the battery management system of the vehicle to wake up periodically when the vehicle is powered off.
The detection module 12 is used for detecting the temperature of the power battery when the battery management system is awakened and the vehicle is not in a charging state.
The starting module 13 is configured to start a power battery heating system of a vehicle to heat the power battery when it is determined that the temperature of the power battery is less than a predetermined first temperature threshold.
Optionally, the apparatus 10 may further comprise a stop control module.
The stop control module is used for controlling a power battery heating system of the vehicle to stop heating the power battery when the temperature of the power battery is larger than a second temperature threshold.
Optionally, the start module 13 comprises a start submodule.
The starting module is used for starting a power battery heating system of the vehicle to heat the power battery when the temperature of the power battery is judged to be smaller than a preset first temperature threshold value and the state of charge of the power battery is judged to be larger than a preset first state of charge threshold value.
Optionally, the apparatus 10 further includes a determining module. The judging module is used for judging whether the vehicle enters a low-temperature protection mode or not.
In this embodiment, the wake-up control module 11 includes a wake-up control sub-module. And the awakening control submodule is used for controlling the BMS of the vehicle to periodically awaken when the judging module judges that the vehicle enters the low-temperature protection mode and the vehicle is powered off.
Optionally, the apparatus 10 further comprises a first entry control module.
The first entering control module is used for controlling the vehicle to enter a low-temperature protection mode when receiving a starting instruction sent by the Internet of vehicles server. The vehicle networking server forwards the opening instruction to a vehicle associated with the user terminal when receiving the opening instruction sent by the user terminal.
Optionally, the apparatus 10 further comprises a second access control module.
The second entry control module is used for controlling the vehicle to enter a low-temperature protection mode when the human-computer interaction device in the vehicle receives the starting instruction.
Optionally, the apparatus 10 further comprises a statistics module and a first exit control module.
The counting module is used for counting the heating times of the power battery during the power-off period of the vehicle.
The first exit control module is used for controlling the vehicle to exit the low-temperature protection mode when the counted heating times reach the preset times.
Optionally, the apparatus 10 further comprises a second exit control module.
The second quit control module is used for controlling the vehicle to quit the low-temperature protection mode when the door of the vehicle is unlocked.
Optionally, the apparatus 10 further comprises a third exit control module.
The third quit control module is used for controlling the vehicle to quit the low-temperature protection mode when the vehicle is in the reserved charging state.
Optionally, the apparatus 10 further comprises a fourth exit control module.
The fourth exit control module is used for controlling the vehicle to exit the low-temperature protection mode when the state of charge of the power battery is smaller than a preset first state of charge threshold value.
Optionally, the device further comprises a charging control module.
The charging control module is used for controlling a charging gun connected with the vehicle to enter a charging state when the state of charge of the power battery after heating is smaller than a preset second state of charge threshold value.
Optionally, the charging control module further comprises a charging control sub-module.
And the charging control submodule is used for controlling a charging gun connected with the vehicle to charge the power battery when the state of charge of the power battery after being heated is smaller than a preset second state of charge threshold value.
Optionally, the value range of the second temperature threshold is determined according to the following formula:
G·T3-a<T2<G·T3+a
wherein, T2Representing said second temperature threshold, T3Indicating a predetermined third temperature threshold, TEnvironment(s)Indicating the ambient temperature, TBattery with a battery cellThe temperature of the power battery is represented, a represents a preset temperature value, c represents the specific heat capacity of the power battery, m represents the mass of the power battery, and g represents a correction coefficient.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Through the technical scheme, when the vehicle is powered off, the battery management system of the power battery is awakened periodically, and when the temperature of the power battery is judged to be too low, the power battery is heated. Therefore, when the vehicle is stored in a low-temperature environment, the power battery can be automatically heated and kept in a proper temperature state so as to meet the power supply requirement of the vehicle.
The present disclosure also provides a vehicle configured to execute the steps in the control method for a power battery described above.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (8)
1. A control method for a power cell, the method comprising:
when a vehicle is powered off, controlling a battery management system of the vehicle to wake up periodically;
when the battery management system is awakened and the vehicle is not in a charging state, detecting the temperature of the power battery;
when the temperature of the power battery is determined to be smaller than a preset first temperature threshold value, starting a power battery heating system of the vehicle to heat the power battery;
when the temperature of the power battery is larger than a second temperature threshold, controlling a power battery heating system of the vehicle to stop heating the power battery, wherein the value range of the second temperature threshold is determined according to the following formula:
G·T3-a<T2<G·T3+a
wherein, T2Representing said second temperature threshold, T3Indicating a predetermined third temperature threshold, T3Is the temperature value, T, reached by the power battery after being heated3Is greater than the lower limit, T, of the temperature required by the normal charge and discharge of the power batteryEnvironment(s)Indicating the ambient temperature, TBattery with a battery cellThe temperature of the power battery is represented, a represents a preset temperature value, a is a bias parameter and is used for correcting the heat capacity difference of the power battery, c represents the specific heat capacity of the power battery, m represents the mass of the power battery, and g represents a correction coefficient.
2. The method of claim 1, wherein the step of activating a power battery heating system of the vehicle to heat the power battery when it is determined that the temperature of the power battery is less than a predetermined first temperature threshold comprises:
and when the temperature of the power battery is judged to be smaller than a preset first temperature threshold value and the state of charge of the power battery is larger than a preset first state of charge threshold value, starting a power battery heating system of the vehicle to heat the power battery.
3. The method of claim 1, further comprising: judging whether the vehicle enters a low-temperature protection mode or not;
the step of controlling the battery management system of the vehicle to periodically wake up when the vehicle is powered off comprises the following steps: when the vehicle is determined to have entered the low-temperature protection mode and the vehicle is powered down, controlling a battery management system of the vehicle to wake up periodically.
4. The method of claim 3, wherein prior to the step of determining whether the vehicle enters a cryo-protected mode, the method further comprises: when a starting instruction sent by a vehicle networking server is received, controlling the vehicle to enter the low-temperature protection mode, wherein the vehicle networking server forwards the starting instruction to a vehicle associated with a user terminal when receiving the starting instruction sent by the user terminal;
alternatively, the first and second electrodes may be,
before the step of determining whether the vehicle enters a low-temperature protection mode, the method further includes: and when a man-machine interaction device in the vehicle receives a starting instruction, controlling the vehicle to enter the low-temperature protection mode.
5. The method of claim 3, further comprising one or more of:
counting the heating times of the power battery during the power-off period of the vehicle; when the counted heating times reach the preset times, controlling the vehicle to exit the low-temperature protection mode;
when the door of the vehicle is unlocked, controlling the vehicle to exit the low-temperature protection mode;
when the vehicle is in a reserved charging state, controlling the vehicle to exit the low-temperature protection mode;
and when the state of charge of the power battery is smaller than a preset first state of charge threshold value, controlling the vehicle to exit the low-temperature protection mode.
6. The method of claim 1, further comprising:
and when the state of charge of the power battery after heating is smaller than a preset second state of charge threshold value, controlling a charging gun connected with the vehicle to enter a charging state.
7. A control device for a power cell, the device comprising:
the wake-up control module is used for controlling the battery management system of the vehicle to wake up periodically when the vehicle is powered off;
the detection module is used for detecting the temperature of the power battery when the battery management system is awakened and the vehicle is not in a charging state;
the starting module is used for starting a power battery heating system of the vehicle to heat the power battery when the temperature of the power battery is judged to be smaller than a preset first temperature threshold value;
the stop control module is used for controlling a power battery heating system of the vehicle to stop heating the power battery when the temperature of the power battery is greater than a second temperature threshold, wherein the value range of the second temperature threshold is determined according to the following formula:
G·T3-a<T2<G·T3+a
wherein, T2Representing said second temperature threshold, T3Indicating a predetermined third temperature threshold, T3Is the temperature value, T, reached by the power battery after being heated3Is greater than the lower limit, T, of the temperature required by the normal charge and discharge of the power batteryEnvironment(s)Indicating the ambient temperature, TBattery with a battery cellRepresenting the temperature of the power battery, a representing a predetermined temperature value, a being a bias parameter for correcting the power batteryThe heat tolerance, c represents the specific heat capacity of the power battery, m represents the mass of the power battery, and g represents a correction coefficient.
8. A vehicle, characterized in that the vehicle is configured to perform the steps in the control method for a power battery according to any one of claims 1-6.
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| CN112026588B (en) * | 2019-11-28 | 2022-05-06 | 长城汽车股份有限公司 | Battery pack control method and system and vehicle |
| CN112026589A (en) * | 2019-11-28 | 2020-12-04 | 长城汽车股份有限公司 | Battery pack control method and system and vehicle |
| CN112824139B (en) * | 2020-05-07 | 2022-06-28 | 长城汽车股份有限公司 | Battery heat preservation method and system for vehicle |
| CN113799657B (en) * | 2020-06-12 | 2023-08-04 | 宇通客车股份有限公司 | Electric automobile and battery self-awakening heating method thereof |
| CN112406459A (en) * | 2020-09-21 | 2021-02-26 | 广东嘉腾机器人自动化有限公司 | Heating system of AGV for outdoor operation and operation method thereof |
| CN112421074B (en) * | 2020-11-20 | 2022-05-24 | 武汉格罗夫氢能汽车有限公司 | Hydrogen energy vehicle fuel cell heat preservation system, method, electronic device, and storage medium |
| CN112659978B (en) * | 2020-12-07 | 2022-12-16 | 北京车和家信息技术有限公司 | Charging and heating control method and device for power battery, medium, equipment and vehicle |
| CN112918327B (en) * | 2021-01-29 | 2022-10-11 | 恒大新能源汽车投资控股集团有限公司 | Electric vehicle battery heat preservation method and device |
| CN115295925B (en) * | 2022-09-30 | 2023-02-21 | 小米汽车科技有限公司 | Method and device for heating battery, battery assembly, storage medium and vehicle |
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| CN103887578B (en) * | 2014-03-25 | 2016-03-30 | 东风汽车公司 | Improve electrokinetic cell heating means and the system of electric automobile low temperature course continuation mileage |
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Denomination of invention: Control method, device and vehicle for power battery Effective date of registration: 20211213 Granted publication date: 20200918 Pledgee: BEIJING AUTOMOTIVE GROUP Co.,Ltd. Pledgor: Borgward Automotive (China) Co., Ltd. Registration number: Y2021990001167 |
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